["Question d'un jour de la semaine de la pump设备每日一题",，叶轮直径为3轮速度为360/min（叶轮外径为360/min叶轮直径为360/min叶轮外径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为3轮速度为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为3轮速度为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶、叶轮直径为3轮速度为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为360/min叶轮直径为366/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮2直径为36l/min叶轮3直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮直径为36l/min叶轮2直径为36l/min叶轮36l/min叶叶为36l/min叶轮2直径为36l/min叶轮2直径为36l/min叶轮2直径为36l/min叶轮36l/min叶直径为36l/min叶轮36l/min叶36l/min叶叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶36l/min叶

2019-06-16View Original

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周一（2019.6.10）https://bbs.hcbbs.com/thread-2724503-1-1.html 1、多级泵中的诸多叶轮（单吸）入口直径都相同（错误--有的首级叶轮入口要大些，为降低汽蚀余量）； 2、对于既定比转速的离心泵效率都有个上限值（正确）。周二（2019.6.11）https://bbs.hcbbs.com/thread-2725077-1-1.html 1、窄流道的离心泵叶轮（低比转速）叶片是圆柱形叶片，不是扭曲的，最主要原因是流道狭小，扭曲叶片对效率提升作用不大。（错误--因为流道狭小，导致扭曲叶片铸造难度大，容易有铸造缺陷） 2、离心泵的叶轮流道过流面积，从叶片入口至出口过程中基本不变。（错误--逐渐扩大）周三（2019.6.12）https://bbs.hcbbs.com/thread-2726007-1-1.html 1、自吸泵泵入口中心线距离水池垂直距离5米，吸入管损失0.2米，入口阀门+弯头损失共0.3米，试问在标准大气压常温状态下，泵能够正常吸上运行，则泵的汽蚀余量NPSHR应不大于（10.3-0.2-0.3-5-0.5=4.3）米。 2、离心泵叶轮直径为310mm，转速为2950RPM，则叶轮外径处线速度为（2950*0.31*3.14159/60=47.88）m/s。周四（2019.6.13）https://bbs.hcbbs.com/thread-2726522-1-1.html 1、填空：单级单吸悬臂卧式离心泵，采用的是口环+平衡孔的结构平衡轴向力，泵进口压力为 0 MPa(A)，泵盖口环内径220mm，叶轮后口环外径219.4mm，叶轮叶片数5片，则叶轮上每个平衡孔直径大小应为（18--后口环间隙环带截面积 x6倍 / 5个孔）mm； 2、判断：射流泵不属于容积泵范畴（正确）。周五（2019.6.14）https://bbs.hcbbs.com/thread-2727111-1-1.html 1、离心泵中的机械损失、容积损失和水力损失，合计一起统称为泵的总效率（错误）； 2、在60Hz的电网频率下，2极Y型电机的同步转速为3600r/min（正确）。周六（2019.6.15）https://bbs.hcbbs.com/thread-2727560-1-1.html 一输水直管线，管内水流动平稳恒定，管进口处直径大于出口处直径，管进入口压力大于管出口压力，管进出口压差换算成水柱为H米，则下列说法正确的是：（BD--除了损失外，还有流速的提高也造成了压力降低） A、直管线总损失为H米 B、直管线总损失小于H米 C、直管线总损失大于H米 D、管出口处流速大于进口处流速周末愉快！，父亲节快乐！！

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